I think there was a split in the mallers after the battle and some stayed at the prison and those of Scratch's group went to this new location and I would assume that since they split the force up more people are able to run away and try to survive away from these psychos.

I think that any rescue attempt for Lizzie will bring a splinter group in the Tower and the so-called "traitor" will emerge as scratch's inside "man".

As for Riley, she has stated he interest in Angel... so any talk of "coming out" is just nuts.